Pressure operated magazine pencil



Feb. 20, 1940. H. MoRLocK PRESSURE OPERATED MAGAZINE PENCIL FiledrAug. 29, 1959 lwf: SS

Patented Feb. 20, 1940.

uNiTEo sTATEs PATENT OFFICE vApplication August 29, 1939,r Serial No. 292,463 In Germany September 23, 1938 3 Claims.

Pressure operated magazine pencils with two gripping elements arranged one behind the other are known, in which a connecting tube enclosing the rear gripping element is connected with 5 the front gripping element by two longitudinal tongues formed on the front edge of the connecting tube, which tongues have bent front ends which are hooked into the tubular rear end of the front gripping element which has' an annular bead open in inward direction and in which the outwardly bent front ends of the longitudinal tongues of the connecting tube engage.

In this manner a movable connection of the front ends of the longitudinal tongues with the Vrear ends of the front gripping element is attained, this mutual movability is, however, not suiiicient in cases where irregularities in the lead diameter occur, to regulate the return movement of the front gripping element so that it reliably closes after the rear gripping element. If it closes prior thereto, in addition to other disadvantages, it s not possible to enable oneV and the same exceptionally long lead to be gripped by both elements at the same time. ,l

This objection does not, however, occur if the front end of the longitudinal tongues, according to the invention, can be shifted freely in the annular bead to such an extent that the front gripping element always closes after the rear gripping element. y

To ensure the free displacement of the outwardly bent front ends of the longitudinal tongues within the annular beadvand not to impede the freedom of movement by the outwardly directed ends bearing against theA inner wall of the bead, a braking device is preferably arranged in the point of the pencil, which device acts on Y a thickened portion of thetube of the front grip- 1 ping element, for example, by means oi resilient arms, so that this element only participates in the longitudinal displacement of the connecting tube which surrounds the rear gripping element when the thickened portion of the tube is located outside the range of the braking device, or when the ends' of the longitudinal tongues on the front or rear end bear against the bead.

An embodiment of the invention is illustrated by way of example in the four figures of the accompanying drawing, in which- Fig. 1 shows the magazine pencil in longitudinal section,

Figs. 2, 3 and. l show the front end of the magazine pencil in longitudinal section, and each snows the gripping element in a different position. c

The pressure operated magazine pencil comprises a tubular front gripping element l and a reartubular gripping element il. These elements are arranged in a tube lll whose rear end is rigidly connected to a lead magazine tube il and pressed in rearward direction by a pressure spring 23. The tube l0 has two longitudinal slots It through which two outwardly bent flaps 32 on the rear edge of the rear gripping element ,Il project and serve for guiding this element. A pressure spring it acts on these iiaps 32 through the intermediary of a sleeve 3i. The tube ill has also on its front end two longitudinal tongues il` displaced through an angle of relative to the longitudinal slots I 6, the front ends 8 of these tongues 9 being bent outwardly. These front ends 8 engage from the inner side in an annular bead 50 formed ona tube section 5 and open in inward direction, this tube section 5 having a narrowed front end fitting tightly on the rear end of the front gripping element l. In this manner the front gripping element l is connected with thelead magazine tube Il.

closed in a casing comprising three screw-connected sleeves 2l, '25 and 36 and a screwed-in point 38. The sleeve 25 has'an inturnedV bottom ange with two radial slots 28 through which the two longitudinal tongues 9 of the tube il! extend. On the inner edge of the flange a tube section 29 is xed, whose rounded inner front `edge 30 acts as clamping ring on the tapered The above mentioned internal parts are enouter surfaces of the clamping jaws i8 of the gripping element I1. A metal casing sleeve di surrounding the whole rear part of the magazine pencil has a portion clamped between the sleeve 36 and the point 38.

The annular bead 50 is vof cylindrical shape and has in its interior so much clearance for the front ends 8 of the longitudinal tongues 9, that these can freely shift longitudinally therein. Consequently, the front gripping element l does not move along the entire path of movement of the lead magazine tube Il, the connecting tube lll and the longitudinal tongues t. The

path of movement of the front gripping element l can be shorter than the displacement of the longitudinal tongues 9 by the distance which these tongues can shift freely in the bead till. Thus, the front gripping element l will no longer project from the aperture in the front a distance equal to the path of movement of the longitudinal tongues 9.' The clamping cone on the front gripping element I is'shorter so that,

taking into consideration all possible inaccuracies i regarding the thickness of the leads, the closing of the front gripping element i only takes splace when the rear gripping element ii is closed. IA lead, 'which is gripped by both elements i and ,di at the same time, can then be inserted without danger of fracture.

To preventthe front gripping element i, during the forward movement of the longitudinal tongues Si, from carrying out a forward shifting movement of the same length owing to the friction between the longitudinal tongues i! and the rear portionr of the tube 5, a braking device 53 is arranged in the point 33 of the pencil and re siliently bears against the tube ofthe front gripper\ element i with at least two oppositely situated arms 5d. The aiect of this br device is .assisted by a thickening 55 on the element i.,

DuringV thev displacement of the longitudinal tongues 9 the gripping element l will rst be carried along by the above mentioned friction until a shoulder 56 on the thickening d5 contacts with the brake jaws 57 (Fig. 2). In this position the clamping cone of the front gripping gielement i is already out of the range of the opening of the point. The front ends of' the lon gitudinal tongues 9 slide forward within the bead d during the continued movement of these tongues owingl to the resistance which the shoulder 56 encounters on the brake jaws 51. During this periodv the front gripping element i does` not continue its forward displacement.4 Only when the front en 9 bear against the front wall of the bead 50, does the front gripping element i continue, its forward movement. This -element allows the lead, which in the meantime is pushedforward by the jaws l@ of the rear gripping element H, to slip partly through it and also. moves partly-with the lead the above mentioned distance in forward direction, the

thickening 55 engaging between the brake jaws disagree di (Fig. 3).. '.iheae latter now hold the front gripping element i, in advanced position until the jaws it oi the rear gripping element are once more in gripping position (Fig. a). Shortly after this moment the front ends 3 again 'bear against the rear end of the bead 5@ whereupon the iront gripping element i, after the jaws I8 of the rear gripping element have assumed their gripping position, will also be pulled back into this position, the thickening 55 again leaving the range of the brake jaws 51' (Fig. l).

. I claim:l

l. In a pressure operated magazine pencil the combination of Vtwo gripping elements arranged one behind the other, a tube enclosing the rear element, two longitudinal tongues on said tube and connecting said tube to the front gripping element, a bead formed on the rear end of said and outwardly bent front ends one on each of said tongues and shiftably engaging in said bead rear gripping element is closed.

HEINRICH MoRLocK.

-front element and open in inward direction, 

